How do I install, and connect to mongodb in node.js on my remote server (ubuntu)?

I have spent at least 3 hours failing to connect to mongodb onto my server. I have managed to install it, create my database, and i have created a new user in the console:

use admin

then

db.createUser(
  {
    user: "admin",
    pwd: "xxx",
    roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
  }
)

And all seems good. Then, to connect to the user in app.js, i do:

var databaseUrl = "mongodb://admin:xxx@108.61.221.63:27018/mydatabasename";
var db = require("mongodb").connect(databaseUrl);

At this point, when i run the server (npm start) this is what i get:

{ [Error: Cannot find module '../build/Release/bson'] code: 'MODULE_NOT_FOUND' }
js-bson: Failed to load c++ bson extension, using pure JS version
{ [Error: Cannot find module '../build/Release/bson'] code: 'MODULE_NOT_FOUND' }
js-bson: Failed to load c++ bson extension, using pure JS version
{ [Error: Cannot find module '../build/Release/bson'] code: 'MODULE_NOT_FOUND' }
js-bson: Failed to load c++ bson extension, using pure JS version
{ [Error: Cannot find module '../build/Release/bson'] code: 'MODULE_NOT_FOUND' }
js-bson: Failed to load c++ bson extension, using pure JS version
/home/adminftp/public_html/globular/node_modules/mongodb/lib/mongo_client.js:92
    throw new Error("no callback function provided");
          ^
Error: no callback function provided
    at Function.MongoClient.connect (/home/adminftp/public_html/globular/node_modules/mongodb/lib/mongo_client.js:92:11)
    at Object.<anonymous> (/home/adminftp/public_html/globular/app.js:31:29)
    at Module._compile (module.js:462:26)
    at Object.Module._extensions..js (module.js:480:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:503:10)
    at startup (node.js:132:16)
    at node.js:817:3

...i have no idea what to make of it.

If anyone has any ideas how i can resolve it i would appreciate it. Thank you!